/ dɪˈreɪndʒd; NAmE / adjective
unable to behave and think normally, especially because of mental illness :
mentally deranged
a deranged attacker
► de·range·ment noun [ U ]:
He seemed to be on the verge of total derangement.
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WORD ORIGIN
late 18th cent.: from French déranger , from Old French desrengier , literally move from orderly rows + -ed .